Clock-pendulum



(No Model.)

s. BASTMAN.

CLOCK PBNDULUM.

No. 337,384. Patented Mer. 9, 1886.

lynlA HTW ummm

UNITED STATES PATENT OFFICE..

SYLVESTER EASTMAN, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE SYN CHRONOUS TIME COMPANY OF PORTLAND, MAINE.

CLOCK-PENDULUM.

SPECFICATION forming part of Letters Patent No. 337,384. dated March 9, 1886.

Application tiled May 18, 1885.

To all whom t may concern:

Be it known that I, SYLvEsTEE EAsTMAN, of Providence, county of Providence, State of Rhode Island, have invented an Improvement in Regulators for Clocks and other Apparatus,

of which the following description, in connection with the, accompanying drawings, is a specification, like letters on the drawings repsenting likeparts.

This invention has for its object to provide the pendulum-rod of aclock or other apparatus-employing a pendulum with a springsupported weight or bob, and suitable regulating devices co-operating therewith,wherehy theweight or bob may be raised or lowered by and against the tension of the said spring, thus aifording very accurate and minute adjustment.

The invention consists of a pendulum rod zo provided with a Weight or bob, combined with `a spring interposed to support the said weight or bob,` and a regulating device co-operating therewith for positively7 moving the Ysaid weightfpr lbob vertically upon the pendulum rod. Y v The weight or bob is herein shown asV bored centrally, andthe pendn`lum-'i'od, encircled by aspiral spring, is passed therethrough, the upper end of the saidspring bearing against an 3o annular or other suitable projection or shoulder within the weight or bob, while its opposite end bears against a suitable nut screwed to the lower end of the pendulum-rod.

The regulating device consists in this instancev of a gear-wheel turning on a screwthreaded portion of the pendulumrod, and meshing with a pinion to the arbor of which is secured a thumb-nut, rotation of the pinion causing the gear-wheel to be turned on the 4o pendulum-rod, and co-operating with the spring, as will be hereinafter more fully described, raising and lowering the weight or bob.

Figure 1 shows in vertical section a pendulun1bob constructed in accordance with this invention, the pendulum-rod being broken off and the regulating device being shown in ele-v vation; Fig. 2, a top view thereof; Fig. 3, a modificationto be referred to, and Fig. 4 a cross-section of Fig. l on the dotted line :v zr. The pendulunrrod A, of usual construction,

Serial No. 165,928. (No mo'el.)

is provided with a weight or bob, B, of cy lindrical shape, said rod A passing axially through the weight or bob B, which is bored forsuch purpose. A spiral spring, b, cncircles the pendulum-rod A within the weight or bob 55 B., the lower end of which bears against a thumb-nut, d, screwed to the lower end of the ,said penduluinrod, while its upper end, bearing againstan annular projection or shoulder, c, integral with and near the upper end of the 6o centralv passage of the weight or bob, sup-k ports the latter, the spring being of sufficient strength to become but slightly compressed while thus resisting the gravitatiug force of the Said weight or bob.

The regulating device consists in this in` stance of a gear-wheel, e, placed within an annular recessed portion at the upper end of the weight or bob B, said gear-wheel having an internally-threaded hub, a, turning upon a 7o screw-threaded portion, f, of the pendulumrod A, the lower face of the'said hub bearing lagainst the upper end of the weight or bob B. I This gear-wheel e meshes with a pinion, g, having 'an arbor, h, to which is rigidly se-,75 cured a thumb-nut, i', for rotating the same. A cap or cover, on, is placed upon the top of the weight or bob B, covering the recessed portion thereof, bearing upon the upper face of the hub a of the gear-wheel e, and serving 8o as a bearing for the arbor h, thus concealing all the operating parts, with the exception of the thumb-nut i.

The operation of the apparatus is as follows: The parts being as shown in 1, it is as 8.5

rsumed that the spring b is compressed both by the gravitating force of the weight or bob B and by the hub a, which has been screwed down somewhat on the thread f. The thumbnut fi, rotated in the direction ofthe arrow, Fig. go 2, will, by its connected pinion, meshing with the gear-wheel e, turn the latter upon the screw-threaded portion f of the pendulum-rod A, and the hub a, bearing against the cover m, co-operating with the tension of the spring, g5 will raise the weight or bob B, but if rotated in the opposite direction will cause the spring to be compressed. The thumb-nut t' is preferably provided with pointers or indicators t', which co-operate with a graduated scale, i, me

to indicate divisions of time, as a second or fraction thereofVsolhat the extent of rotation of the pinion g may be determined accurately when it is desired to raise or lower the weight or bob B. to adust the clock or other apparatus to exact time. A complete rotation of the thumb nut z' in engagement with the gear.- wheelwill' turn the latter on the pendulumrod for but a partial rotation, and by providing the screw -threaded portion with many threads to the inch the weight or bob B may be raised or lowered but a very little, and consequently by only avery small part of a revo lution ot'l the thumbnut the weight orbob B will have given to it but verylittle movement, thus enabling very nice and accurate adj ust-- ment to be effected. The thumb-nut d may also-be turned to adjnstthe tension of the spring-as maybe desired. v

Should-it be desired to apply the regulator to a pendulum-rod havingthe ordinary bob attached ,it.may be placed above the bob, as

shownY in-1Fig.3, serving as a supplemental weight, the parts necessarily beingconstructed on 4a smaller lscala-the operation, however,

being thesame.-

.-Ido not desire to limitmy invention to the exact means shown-and -described vfor -positivelygraising and-loweringthe Weight Orbob B, as other suitable devices may be employed with good results.

It is obvious that the spring b maybe omitted-fas,forinstance,insmall weights or-bobsandthe regulatingdev-ice beoperated-to positively-raise and lowerthe same; and it is also I claim- 1. The threaded pendulum-rod and its movable weight or bob, combined with a spring described.

3. The threaded pendulum-rod and weight or bob loose on the said rod, a spring to support theS'fLid weightor bob, and a gear-wheel, e, yhaving' ip tsthreaded hub a turning on the screw-threaded portion of the rod, combined: w'iththepinion g and the nut t', all substan-` tially asd'es'cribed.

A`45.' ,Thependulum-,rom thespringsupported; 65 weight'forbob thereo'n,'the gear-wheeland,v meansl to move it', combined with an indicat-g ing' device, substantially as described.

weight or bob thereon, combined with the gear having a threaded hub inengagement withthescrew-threads of the said rodhthe pinion stantiallyas described.

In testimony` whereof 1 f'haiv. signed 75 naniet'ov `this Yspecification in the presence of two subscribing witnesses. Y

Witnesses 

